Calculator



FIG. 1 is a perspective view of a calculator, showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left-side elevational view thereof;

FIG. 5 is a right-side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view of the invention.

The broken lines depict environmental subject matter only and form no part of the claimed design. 

I claim the ornamental design for a calculator, as shown and described. 